Custom Report Renderer Throwing An Exception

I have to create a custom rendering extension for SQL Server 2005 Reporting Services.

I followed the instructions in the MSDN article: http://msdn.microsoft.com/msdnmag/issues/05/02/CustomRenderers/default.aspx

I am running the report server under an administrative account provileges on the local machine (XP Pro SP2).
The Reporting Services is installed for SQL Server 2005 Trial/Evaluation Edition (not expired yet) and has been upgraded to Service Pack 2.
The Report Manager runs under a default ASPNET account.

After deploying the extension according to instructions in the article, I see the custom renderer in the list of available rendering formats in the dropdown in the Report Manager.

However, when I select that renderer and click "Export", a new IE window opens with the following error message:


Server Error in '/Reports$SQLSERVER2005DEV' Application.


That assembly does not allow partially trusted callers.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Exception: That assembly does not allow partially trusted callers.

Source Error:





An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:





[Exception: That assembly does not allow partially trusted callers.]

[Exception: An error occurred during rendering of the report.]

[Exception: An unexpected error occurred in Report Processing.]
Microsoft.Reporting.WebForms.ServerReport.ServerUrlRequest(Boolean isAbortable, String url, Stream outputStream, String& mimeType, String& fileNameExtension) +503
Microsoft.Reporting.WebForms.ServerReport.InternalRender(Boolean isAbortable, String format, String deviceInfo, NameValueCollection urlAccessParameters, Stream reportStream, String& mimeType, String& fileNameExtension) +958
Microsoft.Reporting.WebForms.ServerReportControlSource.RenderReport(String format, String deviceInfo, NameValueCollection additionalParams, String& mimeType, String& fileExtension) +84
Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +143
Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +153
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64




Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433


My "why is it not working" question basically breaks down to 3 questions:

1. Why does this error say "partially trusted" whereas the new element in the rssrvpolicy.config file explicitly asks for "FullTrust" permissions?

2. Is there any deployment step that I'm missing?
[For now, it's:
- copy-and-paste the dll into ReportServerin directory;
- add a new CodeGroup element to the rssrvpolicy.config file;
- add a new Extension element to the rsreportserver.config file;
- IIS reset;
- Reporting Services service restart.]

3. Also, I checked the deployment instructions in BOL (Deploying Rendering Extension: http://msdn2.microsoft.com/en-us/library/ms154516.aspx), just to make sure I didn't miss anything.
An interesting this is, the BOL article does NOT mention a requirement for adding a new element into rssrvpolicy.config file.
Is this an error in the September 2007 Books Online?


The same error (regarding "partically trusted" - see above) occurs even after I signed the assembly with a strong name key (although this is not mentioned in the articles, but I figured it might be necessary).

Could someone point me in the right direction as to how to properly deploy a custom rendering extension, please?

Thanks a lot!